mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
184 lines
4.5 KiB
C
184 lines
4.5 KiB
C
![]() |
/*
|
||
|
* IBM System z Huge TLB Page Support for Kernel.
|
||
|
*
|
||
|
* Copyright IBM Corp. 2008
|
||
|
* Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
|
||
|
*/
|
||
|
|
||
|
#ifndef _ASM_S390_HUGETLB_H
|
||
|
#define _ASM_S390_HUGETLB_H
|
||
|
|
||
|
#include <asm/page.h>
|
||
|
#include <asm/pgtable.h>
|
||
|
|
||
|
|
||
|
#define is_hugepage_only_range(mm, addr, len) 0
|
||
|
#define hugetlb_free_pgd_range free_pgd_range
|
||
|
|
||
|
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
|
||
|
pte_t *ptep, pte_t pte);
|
||
|
|
||
|
/*
|
||
|
* If the arch doesn't supply something else, assume that hugepage
|
||
|
* size aligned regions are ok without further preparation.
|
||
|
*/
|
||
|
static inline int prepare_hugepage_range(unsigned long addr, unsigned long len)
|
||
|
{
|
||
|
if (len & ~HPAGE_MASK)
|
||
|
return -EINVAL;
|
||
|
if (addr & ~HPAGE_MASK)
|
||
|
return -EINVAL;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
#define hugetlb_prefault_arch_hook(mm) do { } while (0)
|
||
|
|
||
|
int arch_prepare_hugepage(struct page *page);
|
||
|
void arch_release_hugepage(struct page *page);
|
||
|
|
||
|
static inline pte_t pte_mkhuge(pte_t pte)
|
||
|
{
|
||
|
/*
|
||
|
* PROT_NONE needs to be remapped from the pte type to the ste type.
|
||
|
* The HW invalid bit is also different for pte and ste. The pte
|
||
|
* invalid bit happens to be the same as the ste _SEGMENT_ENTRY_LARGE
|
||
|
* bit, so we don't have to clear it.
|
||
|
*/
|
||
|
if (pte_val(pte) & _PAGE_INVALID) {
|
||
|
if (pte_val(pte) & _PAGE_SWT)
|
||
|
pte_val(pte) |= _HPAGE_TYPE_NONE;
|
||
|
pte_val(pte) |= _SEGMENT_ENTRY_INV;
|
||
|
}
|
||
|
/*
|
||
|
* Clear SW pte bits SWT and SWX, there are no SW bits in a segment
|
||
|
* table entry.
|
||
|
*/
|
||
|
pte_val(pte) &= ~(_PAGE_SWT | _PAGE_SWX);
|
||
|
/*
|
||
|
* Also set the change-override bit because we don't need dirty bit
|
||
|
* tracking for hugetlbfs pages.
|
||
|
*/
|
||
|
pte_val(pte) |= (_SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_CO);
|
||
|
return pte;
|
||
|
}
|
||
|
|
||
|
static inline pte_t huge_pte_wrprotect(pte_t pte)
|
||
|
{
|
||
|
pte_val(pte) |= _PAGE_RO;
|
||
|
return pte;
|
||
|
}
|
||
|
|
||
|
static inline int huge_pte_none(pte_t pte)
|
||
|
{
|
||
|
return (pte_val(pte) & _SEGMENT_ENTRY_INV) &&
|
||
|
!(pte_val(pte) & _SEGMENT_ENTRY_RO);
|
||
|
}
|
||
|
|
||
|
static inline pte_t huge_ptep_get(pte_t *ptep)
|
||
|
{
|
||
|
pte_t pte = *ptep;
|
||
|
unsigned long mask;
|
||
|
|
||
|
if (!MACHINE_HAS_HPAGE) {
|
||
|
ptep = (pte_t *) (pte_val(pte) & _SEGMENT_ENTRY_ORIGIN);
|
||
|
if (ptep) {
|
||
|
mask = pte_val(pte) &
|
||
|
(_SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO);
|
||
|
pte = pte_mkhuge(*ptep);
|
||
|
pte_val(pte) |= mask;
|
||
|
}
|
||
|
}
|
||
|
return pte;
|
||
|
}
|
||
|
|
||
|
static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
|
||
|
unsigned long addr, pte_t *ptep)
|
||
|
{
|
||
|
pte_t pte = huge_ptep_get(ptep);
|
||
|
|
||
|
pmd_clear((pmd_t *) ptep);
|
||
|
return pte;
|
||
|
}
|
||
|
|
||
|
static inline void __pmd_csp(pmd_t *pmdp)
|
||
|
{
|
||
|
register unsigned long reg2 asm("2") = pmd_val(*pmdp);
|
||
|
register unsigned long reg3 asm("3") = pmd_val(*pmdp) |
|
||
|
_SEGMENT_ENTRY_INV;
|
||
|
register unsigned long reg4 asm("4") = ((unsigned long) pmdp) + 5;
|
||
|
|
||
|
asm volatile(
|
||
|
" csp %1,%3"
|
||
|
: "=m" (*pmdp)
|
||
|
: "d" (reg2), "d" (reg3), "d" (reg4), "m" (*pmdp) : "cc");
|
||
|
pmd_val(*pmdp) = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY;
|
||
|
}
|
||
|
|
||
|
static inline void __pmd_idte(unsigned long address, pmd_t *pmdp)
|
||
|
{
|
||
|
unsigned long sto = (unsigned long) pmdp -
|
||
|
pmd_index(address) * sizeof(pmd_t);
|
||
|
|
||
|
if (!(pmd_val(*pmdp) & _SEGMENT_ENTRY_INV)) {
|
||
|
asm volatile(
|
||
|
" .insn rrf,0xb98e0000,%2,%3,0,0"
|
||
|
: "=m" (*pmdp)
|
||
|
: "m" (*pmdp), "a" (sto),
|
||
|
"a" ((address & HPAGE_MASK))
|
||
|
);
|
||
|
}
|
||
|
pmd_val(*pmdp) = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY;
|
||
|
}
|
||
|
|
||
|
static inline void huge_ptep_invalidate(struct mm_struct *mm,
|
||
|
unsigned long address, pte_t *ptep)
|
||
|
{
|
||
|
pmd_t *pmdp = (pmd_t *) ptep;
|
||
|
|
||
|
if (!MACHINE_HAS_IDTE) {
|
||
|
__pmd_csp(pmdp);
|
||
|
if (mm->context.noexec) {
|
||
|
pmdp = get_shadow_table(pmdp);
|
||
|
__pmd_csp(pmdp);
|
||
|
}
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
__pmd_idte(address, pmdp);
|
||
|
if (mm->context.noexec) {
|
||
|
pmdp = get_shadow_table(pmdp);
|
||
|
__pmd_idte(address, pmdp);
|
||
|
}
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
#define huge_ptep_set_access_flags(__vma, __addr, __ptep, __entry, __dirty) \
|
||
|
({ \
|
||
|
int __changed = !pte_same(huge_ptep_get(__ptep), __entry); \
|
||
|
if (__changed) { \
|
||
|
huge_ptep_invalidate((__vma)->vm_mm, __addr, __ptep); \
|
||
|
set_huge_pte_at((__vma)->vm_mm, __addr, __ptep, __entry); \
|
||
|
} \
|
||
|
__changed; \
|
||
|
})
|
||
|
|
||
|
#define huge_ptep_set_wrprotect(__mm, __addr, __ptep) \
|
||
|
({ \
|
||
|
pte_t __pte = huge_ptep_get(__ptep); \
|
||
|
if (pte_write(__pte)) { \
|
||
|
if (atomic_read(&(__mm)->mm_users) > 1 || \
|
||
|
(__mm) != current->active_mm) \
|
||
|
huge_ptep_invalidate(__mm, __addr, __ptep); \
|
||
|
set_huge_pte_at(__mm, __addr, __ptep, \
|
||
|
huge_pte_wrprotect(__pte)); \
|
||
|
} \
|
||
|
})
|
||
|
|
||
|
static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
|
||
|
unsigned long address, pte_t *ptep)
|
||
|
{
|
||
|
huge_ptep_invalidate(vma->vm_mm, address, ptep);
|
||
|
}
|
||
|
|
||
|
#endif /* _ASM_S390_HUGETLB_H */
|